change: remove lodash from utils.js + split speechSynthesis

Author: puemos

lib/ChatBot.jsx

@@ -17,7 +17,8 @@ import {
 } from './components';
 import Recognition from './recognition';
 import { ChatIcon, CloseIcon, SubmitIcon, MicIcon } from './icons';
-import { isMobile, speakFn } from './utils';
+import { isMobile } from './utils';
+import { speakFn } from './speechSynthesis';
 
 class ChatBot extends Component {
   /* istanbul ignore next */

lib/speechSynthesis.js

@@ -0,0 +1,33 @@
+import { isString } from './utils';
+
+const getSpeakText = (step) => {
+  const { message, metadata = {} } = step;
+  if (isString(metadata.speak)) {
+    return metadata.speak;
+  }
+  if (isString(message)) {
+    return message;
+  }
+  return '';
+};
+
+export const speakFn = speechSynthesisOptions => (step, previousValue) => {
+  const { lang, voice, enable } = speechSynthesisOptions;
+  const { user } = step;
+
+  if (!window.SpeechSynthesisUtterance || !window.speechSynthesis) {
+    return;
+  }
+  if (user) {
+    return;
+  }
+  if (!enable) {
+    return;
+  }
+  const text = getSpeakText(step);
+  const msg = new window.SpeechSynthesisUtterance();
+  msg.text = text.replace(/{previousValue}/g, previousValue);
+  msg.lang = lang;
+  msg.voice = voice;
+  window.speechSynthesis.speak(msg);
+};

lib/utils.js

@@ -1,27 +1,3 @@
-import _ from 'lodash';
-
 export const isMobile = () => /iphone|ipod|android|ie|blackberry|fennec/i.test(navigator.userAgent);
 
-export const speakFn = speechSynthesisOptions => (step, previousValue) => {
-  const { lang, voice, enable } = speechSynthesisOptions;
-  const { user, message, metadata = {} } = step;
-
-  if (user) {
-    return;
-  }
-  if (!enable) {
-    return;
-  }
-
-  const text = _.cond([
-    [() => _.isString(metadata.speak), _.constant(metadata.speak)],
-    [() => _.isString(message), _.constant(message)],
-    [_.stubTrue, _.constant('')],
-  ])(step);
-
-  const msg = new SpeechSynthesisUtterance();
-  msg.text = text.replace(/{previousValue}/g, previousValue);
-  msg.lang = lang;
-  msg.voice = voice;
-  window.speechSynthesis.speak(msg);
-};
+export const isString = value => typeof value === 'string';